Perhaps you should try some spelling variations:
"using computation and undersampling problem" » "using computation and undersampling problems" (Expand search), "using computational and undersampling problem" (Expand search), "using imputation and undersampling problem" (Expand search), "using compilation and undersampling problem" (Expand search), "using computation of undersampling problem" (Expand search), "using computation _ undersampling problem" (Expand search), "using computation and oversampling problem" (Expand search)
"using python python python programming" » "using pythons python python programming" (Expand search), "using piton python python programming" (Expand search), "using pitons python python programming" (Expand search), "usando python python python programming" (Expand search), "in python python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computation and undersampling problem\") OR (\"using python python python programming\"))~".
• Removing quotes may allow a broader search: (( using computation and undersampling problem ) OR ( using python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using computation and undersampling problem") OR ("using python python python programming"))*.